Select the letter-cluster that can replace the question mark (?) in the given letter-cluster series.
POUR, MLRO, IHNK, DCIF, ?
Answer & explanation
Correct answer: option 2

Explanation:
POUR, MLRO, IHNK, DCIF, ?
The logic followed here is :
P → (-3) → M → (-4) → I → (-5) → D → (-6) → X
O → (-3) → L → (-4) → H → (-5) → C → (-6) → W
U → (-3) → R → (-4) → N → (-5) → I → (-6) → C
R → (-3) → O → (-4) → K → (-5) → F → (-6) → Z
So, the letter-cluster that replaces the (?) to complete the series is "XWCZ"